CN103570081A - Titanium dioxide waste acid recycling and processing system - Google Patents
Titanium dioxide waste acid recycling and processing system Download PDFInfo
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- CN103570081A CN103570081A CN201310572660.2A CN201310572660A CN103570081A CN 103570081 A CN103570081 A CN 103570081A CN 201310572660 A CN201310572660 A CN 201310572660A CN 103570081 A CN103570081 A CN 103570081A
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Abstract
The invention relates to a titanium dioxide waste acid recycling and processing system which has the innovative characteristics that the system mainly comprises a reactor, a cleaning buffer tank, a gas booster, a gas cooler, a defogger, a storage distribution tank and a hydrogen-fired steam boiler, which are arranged in sequence; a material guiding bulge is arranged at the center of a bottom plate of the reactor; an iron powder feeding device provided with a liquid seal, and a liquid level detection component are arranged at the top of the reactor; the hydrogen-fired steam boiler mainly comprises a boiler body, a boiler barrel, a water wall tube, a convection tube bundle, a coal economizer, a hydrogen combustor and a safety pressure release door; hydrogen which is generated by reactions in the reactor and carries a small quantity of water vapor and acidic gas enters the cleaning buffer tank, then enters the gas booster for boosting after foreign gases are removed by an alkali cleaning solution, passes the gas cooler and the defogger to remove moisture, and is stored in the storage distribution tank and distributed to the hydrogen-fired steam boiler to be burnt for preheating. The system has the advantages that the reaction efficiency is high, hydrogen has low possibility of leakage or blast, and the use is safe and reliable.
Description
Technical field
The present invention relates to a kind of titanium pigment waste acid and recycle treatment system.
Background technology
Titanium dioxide formal name used at school is titanium dioxide, titanium dioxide is considered at present the best a kind of white pigment of performance in the world, account for 80% of whole white pigment usage quantitys, be widely used in the industry such as coating, plastics, papermaking, printing-ink, chemical fibre, rubber, makeup.
Titanium dioxide manufacture method has two kinds at present: sulfuric acid process (Sulphate Process) and chlorination process (Chloride Process).Sulfuric acid process mainly be take as main in current domestic titanium dioxide producer, it is that titanium-iron powder and the vitriol oil are carried out to acidolysis reaction production titanyl sulfate, through hydrolysis, generate metatitanic acid, more obtain titanium dioxide product through calcining, pulverizing, this method can be produced anatase titanium dioxide and Rutile type Titanium Dioxide.The advantage of sulfuric acid process is that to take the low ilmenite being easy to get of valency and sulfuric acid be raw material, and technology is more ripe, and equipment is simple, and anticorrosive easily solves.
In the process with method for producing gtitanium dioxide with sulphuric acid, can produce byproduct dilute sulphuric acid, the concentration of dilute sulphuric acid, in 20 ~ 25% left and right, is abroad concentrated to more than 70% and is recycled by thickening equipment at present; And the restriction of the domestic structure due to domestic thickening equipment, anticorrosion material, when concentrated, energy consumption is large, and need to clean frequently, therefore lower to the recycling value of this byproduct.And react with iron filings, iron powder by dilute sulphuric acid, generate ferrous sulfate, both can consume dilute sulphuric acid, can produce again the products such as ferrous sulfate, reach the bumper harvests of environmental protection and economy benefit.Iron powder reacts with dilute sulphuric acid in the process of producing ferrous sulfate, the a large amount of hydrogen of meeting by-product, and hydrogen is inflammable and explosive, it is to requiring very high for realizing reaction that the process of this recycling relates to and the safety performance of combustion equipment, in addition, when iron powder reacts with spent acid, be easily deposited on reactor bottom, cannot fully react, reduce reaction efficiency.Therefore research and develop a kind of be applicable to that titanium pigment waste acid is recycled and safe and reliable equipment imperative.
Summary of the invention
The technical problem to be solved in the present invention is to provide the high and safe and reliable titanium pigment waste acid of a kind of reaction efficiency and recycles treatment system.
For solving the problems of the technologies described above, technical scheme of the present invention is: a kind of titanium pigment waste acid is recycled treatment system, its innovative point is: mainly comprise the reactor, cleaning surge tank, gas booster, gas cooler, mist eliminator, storage distribution tank and the steam boiler by hydrogen as fuel that set gradually, reactor is for the reduction reaction of titanium pigment waste acid and iron powder, mainly comprise reactor shell, whipping appts, iron powder feeding device, reactor shell is that a upper and lower end by back taper cylindrical shell arranges the reverse frustoconic that top board and base plate form; Liquid adding bottle, iron powder feeding device and escape pipe are set on top board, and the center of base plate is provided with a semisphere guide projection, and the non-guide elevated regions of base plate has a drain hole; Whipping appts comprises stir shaft, agitating vane, drive-motor, stir shaft is vertically set in reactor shell, stir shaft upper end is stretched out reactor shell and is connected with the drive-motor that is arranged on reactor shell top, agitating vane is installed in the lower end of stir shaft, and this agitating vane is one by cross bar two ends, the H shape enamel blade of perpendicular leaf to be set; Iron powder feeding device comprises filling tube, loading hopper, quantitative discharge component, safety shutoff valve, leve detecting assembly, filling pipe and fluid level controller; Filling tube is vertically mounted on the top of reactor, and the upper end of filling tube arranges loading hopper, and filling tube middle part arranges quantitative discharge component, and this quantitative discharge component has a servo drive motor that drives quantifying feed, and safety shutoff valve is installed in filling tube bottom; Leve detecting assembly, comprise liquid level sensor, middle liquid level sensor, lower liquid level sensor, middle liquid level sensor sleeve pipe and lower liquid level sensor sleeve pipe, middle liquid level sensor sleeve pipe and lower liquid level sensor sleeve pipe are a body being obliquely installed, the upper end of body arranges middle liquid level sensor, lower liquid level sensor, and the lower end of body is communicated with filling tube top; Upper liquid level sensor is arranged in loading hopper; The water outlet of filling pipe is positioned at the top of loading hopper, has a moisturizing magnetic valve on filling pipe; Fluid level controller signal input part is connected with upper, middle and lower liquid level sensor, and the signal output part of fluid level controller is connected with moisturizing magnetic valve, safety shutoff valve, servo drive motor; The tank body top of cleaning surge tank has an inlet pipe and an air outlet, and the lower end of inlet pipe is stretched into tank base and is positioned at below scavenging solution liquid level, and the upper end of inlet pipe is communicated with reactor escape pipe; Clean the air outlet of surge tank successively by entering storage distribution tank after gas booster, gas cooler, mist eliminator, described storage distribution tank provides incendivity hydrogen for steam boiler by hydrogen as fuel; Steam boiler by hydrogen as fuel mainly comprises body of heater, drum, water wall tube, convection bank, economizer, hydrogen gas combustor and safety relief door, body of heater comprises ,You combustion chamber, left combustion chamber, left convection chamber, right convection chamber and public convection chamber, body of heater integral body is by between a pair of left and right combustion chamber, public convection chamber being set, and by left and right convection chamber independently, is communicated with and formed a M shape between the left and right combustion chamber of public convection chamber and both sides; In the both sides of ,You combustion chamber, left combustion chamber, public convection chamber and the outside of left convection chamber, right convection chamber safety relief door is all set; Drum comprises a upper shell, two lower shells and the convection bank, the water wall that are communicated with upper and lower cylindrical shell; Described upper shell is horizontally set on the left and right convection chamber of body of heater top, and its axis is parallel with the long axis direction of left and right convection chamber; Two described lower shells are horizontally set on respectively the below, gap between public convection chamber and left and right combustion chamber, and its axis is parallel with the long axis direction of left and right convection chamber; Convection bank is through left convection chamber, right convection chamber and public convection chamber; Water wall is arranged on the sidewall of the furnace body of combustion chamber, left convection chamber, right convection chamber and public convection chamber; Economizer is arranged in body of heater flue outlet.
The invention has the advantages that:
The byproduct dilute sulphuric acid producing in method for producing gtitanium dioxide with sulphuric acid technique is introduced in reactor by liquid adding bottle, by iron powder feeding device safety in reactor, add iron powder, reaction generates ferrous sulfate and hydrogen, copperas solution is discharged from reactor bottom drain hole, hydrogen carries a small amount of water vapour, sour gas enters cleaning surge tank from reactor head escape pipe, in cleaning surge tank, by alkaline cleaning fluid, remove after foreign gas, enter again gas booster and carry out supercharging, entering gas cooler removes the water vapor condensation in hydrogen again, then enter mist eliminator and further remove moisture, hydrogen after final dewatering stores and distributes to steam boiler by hydrogen as fuel burning by storage distribution tank and carries out pre-thermal utilization.Byproduct dilute sulphuric acid is neutralized, reduce discharge pH value, and when making ferrous sulfate, the hydrogen of generation is made full use of.
The iron powder that the guide protrusions of reactor makes to be deposited in reactor shell bottom can be distributed to the surrounding of guide protrusions, and agitating vane is when rotating, and can stir fully this subregion, and then guarantee sufficient reacting.Upper and lower liquid level sensor by leve detecting assembly detects the water level in filling tube, loading hopper, and by fluid level controller, controls corresponding moisturizing magnetic valve and open and close, and makes liquid level remain on the height of a safety, guarantees to realize water seal; The setting of safety shutoff valve can avoid filling pipe moisturizing causes water seal to lose efficacy smoothly after hydrogen overflow, guarantee safety.
Body of heater adopts double combustion chamber to carry out the burning of hydrogen, single hydrogen gas combustor can suitably reduce air demand, by two convection chambers, coordinate absorbing radiation heat and convection heat to produce steam with water wall, convection bank in public convection chamber simultaneously, guarantee that heat energy can fully be absorbed by convection bank, cold-water wall, improve heat utilization rate.The upper shell of drum is horizontally set on the left and right convection chamber top of body of heater, makes upper shell have very large liquid level, and steam output is large, and level fluctuation is little, for improving steam parameter, provides possibility.The setting of many places safe unloading pressure door can be released in time to the pressure of detonation in body of heater, in order to avoid damage body of heater causes more serious accident.
Accompanying drawing explanation
Fig. 1 is that titanium pigment waste acid of the present invention is recycled treatment system schematic diagram.
Fig. 2 is structure of reactor schematic diagram in the present invention.
Fig. 3 is iron powder feeding device structural representation in the present invention.
Fig. 4 is steam boiler by hydrogen as fuel structural representation of the present invention.
Fig. 5 is barrel structure schematic diagram in the present invention.
Fig. 6 is hydrogen gas combustor structural representation of the present invention.
Fig. 7 is combustion liner in the present invention, combustion head, gas supply pipeline and assisted gas body steam line annexation schematic diagram.
Embodiment
Embodiment
Refer to Fig. 1, the present invention has disclosed a kind of titanium pigment waste acid and has recycled treatment system, and its innovative point is: mainly comprise the reactor 1, cleaning surge tank 2, gas booster 3, gas cooler 4, mist eliminator 5, storage distribution tank 6 and the steam boiler by hydrogen as fuel 7 that set gradually.
As shown in Figure 2, reactor mainly comprises reactor shell, whipping appts, iron powder feeding device, and reactor shell is that a upper and lower end by back taper cylindrical shell 112 arranges the reverse frustoconic that top board 111 and base plate 113 form; Liquid adding bottle 116, iron powder feeding device 12 and escape pipe are set on top board 111, and base plate 113 center is provided with a semisphere guide projection 114, and the non-guide elevated regions of base plate 113 has a drain hole 115.Whipping appts comprises stir shaft 131, agitating vane 132, drive-motor 133, stir shaft 131 is vertically set in reactor shell, stir shaft 131 upper ends are stretched out reactor shell and are connected with the drive-motor 133 that is arranged on reactor shell top, agitating vane 133 is installed in the lower end of stir shaft 131, this agitating vane 133 is one by cross bar two ends, the H shape enamel blade of perpendicular leaf to be set, and this two perpendicular leaf is positioned at the both sides of guide projection 114.Iron powder feeding device 12, as shown in Figure 3, comprises filling tube 121, loading hopper 122, quantitative discharge component, safety shutoff valve 124, leve detecting assembly, filling pipe 126, moisturizing magnetic valve 127 and fluid level controller 128; Filling tube 121 is vertically mounted on the top of reactor, and the upper end of filling tube 111 arranges loading hopper 122; This quantitative discharge component has a servo drive motor 1232 that drives quantifying feed, and safety shutoff valve 124 is arranged on the bottom of filling tube 121; Leve detecting assembly comprises liquid level sensor 1251, middle liquid level sensor 1252, lower liquid level sensor 1253, middle liquid level sensor sleeve pipe 1254 and lower liquid level sensor sleeve pipe 1255, middle liquid level sensor sleeve pipe 1254 and lower liquid level sensor sleeve pipe 1255 are a body being obliquely installed, the upper end of body arranges middle liquid level sensor 1252, lower liquid level sensor 1253, and the lower end of body is communicated with filling tube 121 tops; Upper liquid level sensor 1251 is arranged in loading hopper 122; The water outlet of filling pipe 126 is positioned at the top of loading hopper 122, and moisturizing magnetic valve 127 is set on filling pipe 126; Fluid level controller 128 signal input parts are connected with upper liquid level sensor 1251, middle liquid level sensor 1252, lower liquid level sensor 1253, and the signal output part of fluid level controller 128 is connected with moisturizing magnetic valve 127, safety shutoff valve 124, servo drive motor 1232.
The tank body top of cleaning surge tank 2 has an inlet pipe and an air outlet, and the lower end of inlet pipe is stretched into tank base and is positioned at below alkaline cleaning fluid liquid level, and the upper end of inlet pipe is communicated with reactor escape pipe; The air outlet of cleaning surge tank 2 stores distribution tank 6 by entering after gas booster 3, gas cooler 4, mist eliminator 5 successively, stores distribution tank 6 and provides incendivity hydrogen for steam boiler by hydrogen as fuel 7.
As shown in Figure 4, steam boiler by hydrogen as fuel 7 mainly comprises body of heater, drum, water wall tube 73, convection bank 74, economizer 75, hydrogen gas combustor 76 and safety relief door 77.
Body of heater comprises left combustion chamber 71a,You combustion chamber 71b, left convection chamber 71c, right convection chamber 71d and public convection chamber 71e, body of heater 1 integral body is by between a pair of left combustion chamber 71a,You combustion chamber 71b, public convection chamber 71e being set, and by independently left convection chamber 1c, right convection chamber 71d, is communicated with and formed a M shape between the left combustion chamber 71a,You combustion chamber 71b of public convection chamber 71e and both sides.In the both sides of left combustion chamber 71a,You combustion chamber 71b, public convection chamber 71e and the outside of left convection chamber 71c, right convection chamber 71d safety relief door 77 is all set.
As shown in Figure 5, drum comprises a upper shell 721, two lower shells 722 and is communicated with upper shell 721, the convection bank 73 of lower shell 722, water wall 74; Upper shell 721 is horizontally set on the left convection chamber 71c of body of heater, right convection chamber 71d top, and its axis is parallel with the long axis direction of left convection chamber 71c, right convection chamber 71d; Two lower shells 722 are horizontally set on respectively the below, gap between public convection chamber 71e and left combustion chamber 71a,You combustion chamber 71b, and its axis is parallel with the long axis direction of public convection chamber 71e; Convection bank 73 is through left convection chamber 71c, right convection chamber 71d and public convection chamber 71e; Water wall 74 is arranged on the sidewall of the furnace body of left combustion chamber 71a,You combustion chamber 71b, left convection chamber 71c, right convection chamber 71d and public convection chamber 71e; Economizer 75 is arranged in body of heater flue outlet.
Concrete: as shown in Figure 6,7, combustion-supporting gas air feed storehouse 761, the front end of this warehouse is provided with combustion liner 762, the built-in airflow pressure switch in warehouse bottom and the air door controllable register group 765 being driven by servomotor 7651, warehouse lower end is provided with the combustion-supporting gas air feed blower fan 764 being driven by variable-frequency motor 7641.Combustion liner 762 is arranged on the sidewall in combustion-supporting gas air feed storehouse, and its front end stretches out combustion-supporting gas air feed storehouse 761 sidewalls.Combustion liner 762 consists of the inner tube 7622 coaxially arranging and outer tube 7621, and the end of inner tube 7622, outer tube 7621 is communicated with combustion-supporting gas air feed storehouse 761; The front end of outer tube 7621 pod 7623 that has been threaded, the front end infolding of this pod 7623 is to inner tube side.Combustion head 763 is welded on inner tube front end, and this combustion head 763 has the spheric projection and the planar annular being positioned at outside spheric projection that are positioned at combustion head center; Spheric convex center arranges a large manhole, and is uniformly distributed some small circular through holes at the sphere of large manhole outer spheric projection, and the axis of small circular holes is through the centre of sphere of spheric projection; On planar annular, be provided with the some arcuate sockets of combustion head center as the distribution of center of circle circular array of take.Gas supply pipeline 766 has a main gas supply pipeline 7661 and some auxiliary gas supply pipelines 7662 distributing ringwise centered by main gas supply pipeline 7661; Main gas supply pipeline 7661 is arranged in inner tube 7622, and the annular edge edge of the front end of main gas supply pipeline 7661 and combustion head spheric projection is connected and fixed, and is communicated with the small circular through hole of combustion head spheric projection; Auxiliary gas supply pipeline 7662 is distributed between inner tube 7622 and outer tube 7621, and the front end of auxiliary gas supply pipeline 7662 stretches out inner tube 7622 front ends and is tilted to inner tube side.The end of auxiliary gas supply pipeline 7662 is communicated with the middle part of main gas supply pipeline 7661, and main gas supply pipeline 7661 ends have a gas consumption adjusting valve 7663; Assisted gas body steam line 767 is built in main gas supply pipeline 7661 centers, and its front end is communicated with the large manhole of combustion head spheric projection.This assisted gas body steam line 767 passes through independently flow control valve 767 air feed by combustion-supporting gas air feed blower fan 764.
Principle of work:
The byproduct dilute sulphuric acid producing in method for producing gtitanium dioxide with sulphuric acid technique is introduced in reactor by liquid adding bottle, then closed safe stopping valve, in loading hopper, drop into quantitative iron powder, by filling pipe, in loading hopper, add water and carry out fluid-tight, make reactor inner chamber not with extraneous conducting, on elevation of water surface, after liquid level sensor, fluid level controller is controlled moisturizing closed electromagnetic valve; During continuous dosing, open safety shutoff valve, by servo drive motor drive shaft, rotated, and then realize the continuous dosing of iron powder; In continuous dosing process, part water is along with iron powder enters in reactor, and water level declines; After water level is lower than middle liquid level sensor, fluid level controller control moisturizing magnetic valve is opened and is carried out moisturizing, if moisturizing in time, after making water level lower than lower liquid level sensor, fluid level controller controls safety shutoff valve and cuts out, and avoids water seal to lose efficacy and causes hydrogen to overflow.During reaction, drive-motor drives agitating vane to rotate, and iron powder and reaction solution are fully uniformly mixed, and is slipped to the surrounding of guide protrusions after easily the iron powder of precipitation drops in guide protrusions by the inclined-plane of guide protrusions, again be stirred, and then guarantee that all iron powders all can fully react with reaction solution;
Reaction generates ferrous sulfate and hydrogen, copperas solution is discharged from reactor bottom drain hole, hydrogen carries a small amount of water vapour, sour gas enters cleaning surge tank from reactor head escape pipe, in cleaning surge tank, by alkaline cleaning fluid, remove after foreign gas, enter again gas booster and carry out supercharging, entering gas cooler removes the water vapor condensation in hydrogen again, then enter mist eliminator and further remove moisture, the hydrogen after final dewatering stores and distributes to steam boiler by hydrogen as fuel burning by storage distribution tank and carries out pre-thermal utilization.
Hydrogen enters the hydrogen gas combustor of steam boiler by hydrogen as fuel, and hydrogen gas combustor adopts the combustion-supporting gas and hydrogen mixing air-out form of a Multi-layered wound, mixes; The high voltage electric that seed element provides by ignition transformer discharges, and then produces electric arc and light mixed gas and burn; Rate of combustion reaches 100%, stopped remaining hydrogen generation, gather, improve safety performance.
Claims (1)
1. titanium pigment waste acid is recycled a treatment system, it is characterized in that: mainly comprise the reactor, cleaning surge tank, gas booster, gas cooler, mist eliminator, storage distribution tank and the steam boiler by hydrogen as fuel that set gradually,
Reactor, for the reduction reaction of titanium pigment waste acid and iron powder, mainly comprises reactor shell, whipping appts, iron powder feeding device, and reactor shell is that a upper and lower end by back taper cylindrical shell arranges the reverse frustoconic that top board and base plate form; Liquid adding bottle, iron powder feeding device and escape pipe are set on top board, and the center of base plate is provided with a semisphere guide projection, and the non-guide elevated regions of base plate has a drain hole; Whipping appts comprises stir shaft, agitating vane, drive-motor, stir shaft is vertically set in reactor shell, stir shaft upper end is stretched out reactor shell and is connected with the drive-motor that is arranged on reactor shell top, agitating vane is installed in the lower end of stir shaft, and this agitating vane is one by cross bar two ends, the H shape enamel blade of perpendicular leaf to be set; Iron powder feeding device comprises filling tube, loading hopper, quantitative discharge component, safety shutoff valve, leve detecting assembly, filling pipe and fluid level controller; Filling tube is vertically mounted on the top of reactor, and the upper end of filling tube arranges loading hopper, and filling tube middle part arranges quantitative discharge component, and this quantitative discharge component has a servo drive motor that drives quantifying feed, and safety shutoff valve is installed in filling tube bottom; Leve detecting assembly, comprise liquid level sensor, middle liquid level sensor, lower liquid level sensor, middle liquid level sensor sleeve pipe and lower liquid level sensor sleeve pipe, middle liquid level sensor sleeve pipe and lower liquid level sensor sleeve pipe are a body being obliquely installed, the upper end of body arranges middle liquid level sensor, lower liquid level sensor, and the lower end of body is communicated with filling tube top; Upper liquid level sensor is arranged in loading hopper; The water outlet of filling pipe is positioned at the top of loading hopper, has a moisturizing magnetic valve on filling pipe; Fluid level controller signal input part is connected with upper, middle and lower liquid level sensor, and the signal output part of fluid level controller is connected with moisturizing magnetic valve, safety shutoff valve, servo drive motor;
The tank body top of cleaning surge tank has an inlet pipe and an air outlet, and the lower end of inlet pipe is stretched into tank base and is positioned at below alkaline cleaning fluid liquid level, and the upper end of inlet pipe is communicated with reactor escape pipe; Clean the air outlet of surge tank successively by entering storage distribution tank after gas booster, gas cooler, mist eliminator, described storage distribution tank provides incendivity hydrogen for steam boiler by hydrogen as fuel;
Steam boiler by hydrogen as fuel mainly comprises body of heater, drum, water wall tube, convection bank, economizer, hydrogen gas combustor and safety relief door, body of heater comprises ,You combustion chamber, left combustion chamber, left convection chamber, right convection chamber and public convection chamber, body of heater integral body is by between a pair of left and right combustion chamber, public convection chamber being set, and by left and right convection chamber independently, is communicated with and formed a M shape between the left and right combustion chamber of public convection chamber and both sides; In the both sides of ,You combustion chamber, left combustion chamber, public convection chamber and the outside of left convection chamber, right convection chamber safety relief door is all set; Drum comprises a upper shell, two lower shells and the convection bank, the water wall that are communicated with upper and lower cylindrical shell; Described upper shell is horizontally set on the left and right convection chamber of body of heater top, and its axis is parallel with the long axis direction of left and right convection chamber; Two described lower shells are horizontally set on respectively the below, gap between public convection chamber and left and right combustion chamber, and its axis is parallel with the long axis direction of left and right convection chamber; Convection bank is through left convection chamber, right convection chamber and public convection chamber; Water wall is arranged on the sidewall of the furnace body of combustion chamber, left convection chamber, right convection chamber and public convection chamber; Economizer is arranged in body of heater flue outlet.
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| CN103570081B (en) | 2015-05-06 |
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